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Even if this is a theoretical issue since it is not possible to perform XDP_REDIRECT on a non-linear xdp_frame, veth driver does not account paged area in ndo_xdp_xmit function pointer. Introduce xdp_get_frame_len utility routine to get the xdp_frame full length and account total frame size running XDP_REDIRECT of a non-linear xdp frame into a veth device. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Introduce veth_convert_xdp_buff_from_skb routine in order to convert a non-linear skb into a xdp buffer. If the received skb is cloned or shared, veth_convert_xdp_buff_from_skb will copy it in a new skb composed by order-0 pages for the linear and the fragmented area. Moreover veth_convert_xdp_buff_from_skb guarantees we have enough headroom for xdp. This is a preliminary patch to allow attaching xdp programs with frags support on veth devices. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Allow increasing the MTU over page boundaries on veth devices if the attached xdp program declares to support xdp fragments. Enable NETIF_F_ALL_TSO when the device is running in xdp mode. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
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Pull request for series with
subject: introduce xdp frags support to veth driver
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=614531